Lost my passport during my hometown visit

I am in the process of issuing myself a new passport but I remember I have a 再入国許可 stamp in my old passport when I left the country. I only left Japan for about 1.5 month do I need to do anything before I fly to Japan again? Could the 入国許可 be given in Japanese airport?

I have a 1-year Business manager VISA if that matter.

by MaryPaku